Sash-pulley.



Patented Mar. 4, I902.

'A. JOHNSTON SASH PULLEY. Application filed Aug. 6, 71901.)

(No Modeln UNIT D STATES.

PATENT OFFICE.

ALLEN JOHNSTON, or orruMwA, IOWA.

)SASH-PULLEY.

SPECIFICATION formingpart of. Letters Patent No. 694,482, dated March 4, 1902.

Application filed August 6.1901. Serial No. 71,078. (Nomo delQ) To all whom itJM/CLZ/ concern.-

Be it known that I, ALLEN J OHNSTON, a citizen of the United States of America, and a resident of Ottumwa, Wapello county, Iowa, have invented a new and useful Sash-Pulley, of which the followingis a specification.

The object of this invention is to provide a pulley having a raceway on its interior shaped to receive bearing-balls and a rim shaped to carry a cord or tape, together with means for supporting said pulley.

A further object of this invention is to provide an improved pulley'in which the casing is made by stamping sheet metal and the Wheel is made by stamping sheet metal and is mounted with bearing-balls in the casing, the casing forming a bearing-surface or cone for the balls.

A further object of my invention is to provide a casing stamped of sheet metal, the central portions of the sides of the casing being depressed to form a bearing-surface for a ballbearing.

My invention consists of the construction, arrangement, and combination of elements hereinafter set forth, pointed out in my claims, and illustrated by the accompanying drawings, in which Figure 1 is a side elevation of the complete sash-pulley. Fig. 2 is an elevation of the sash-pulley, one of the side plates and a portion of the connecting-rivet being removed. Fig. 3 is a vertical section of the device on the indicated line 3 3 of Fig. 1. Fig. 4 is a face elevation of the device. Fig. 5 is a rear face View of the face-plate of the device detached from the side plates. Fig. 6 is a side View of one member of the grooved wheel or pulley employed in the device. Opposite sides of the pulley are shown in Figs. 2 and 6. Fig. 7 is a face view of a pulley in which the face-plate is removed and the wheel is formed with a rim to receive a flat metal tape.

In the construction of the device as shown the face-plate 10 is employed. The face-plate 10 is formed of sheet metal by stamping and is oblong in face view, with parallel sides and rounded ends; butt-he side margins of said plate may be undulated or shaped fancifully, if desired. An opening 11 of oblong shape, with parallel sides and rounded ends,i s formed in the central portion of the face-plate 10, and

portions of the face-plate removed to form said opening 11 are bent inward and produce flanges 12 13 at right angles to the inner face of the plate. Ears 141 15 16 17 are formed on and project'at right angles from the inner margins of the flanges 12 13 (see Fig.5) and extend outward parallel with the inner face of the plate 10 and spaced apart therefrom. (See Fig. 2.) A side plate 18 is formed of sheet metal by stamping and is shaped with one plane edge 18 arranged to contact with the inner face of the plate 10. The end portions 18 18 of the plate 18 are curved and bent inward approximately to the central line of the plate 10, and slots 18 18 are formed in said plate 18 near the margin 18 to receive and be held by the ears 15 17 on the flanges of the face-plate. After the side plate 18 is engaged by the ears 15 17 said ears are bent down upon the outer face of said side plate and toward the face-plate 10, thus securing and holding the plates together; A side plate 19, the exact counterpart of the side plate 18, is provided and is mounted in opposition to the plate 18 and secured by engagement with the ears 14 16 on the face-plate. The face-plate 10 and side plates 18 19 when mounted as shown form a casing, and the central portions of the side plates are pressed in ward to form a bearing-surface or cone, the centers of said plates coming into contact with each other and each plate contributing One-half 20 21 to the formation of the cone. (See Fig. 3.) I use the Word cone in a broad sense to designate any bearing-surface, such as frustum-shaped, concavo-convex in section, an arc in section, or a multiple of connected arcs in section. The centers of the side plates Within the cone members are apertured for the reception of a rivet 22, whereby the side plates are connected rigidly; but said rivet is not applied until the pulley is completed otherwise, as hereinafter described. A grooved wheel or pulley is provided and formed of two counterpart members 23 24. Each of the members 23 24 is formed of sheet metal by stamping and comprises a fiat ring portion 25, aninner outwardly-curved ring portion 26, providing onehalf of a raceway, and an outer outwardlycurved ring portion 27, providing one-half of a rim. Referring to Fig. 7, it will be seen that the ring portion 27 of the wheel or pulley members may be formed at right angles to the sides of the members, thus producing a rim having a face parallel with the axis of the wheel and arranged to support a tape of flat metal or fabric. The members 23 24 are placed in opposition to each other, with the inner faces of their flat ring portions in contact with each other and secured by rivets 28 29 3O 31. Suchpositioning of the members 23 24 forms an inner groove or raceway in opposition to the groove formed by bearingsurfaces of the cone members 20 21 when the side plates 18 19 are approximated and connected, with said cone members located in the apertures or central openings of the wheel members. Bearing-balls 32, in this instance eight in number, are mounted in the groove or raceway formed on the interior of the wheel or pulley and contact with the cone members 20 21. The curvature of the balls does not conform to the transverse curvature of the ring portions 26 of the wheel members and the faces of the cone members 20 21-that is to say, the balls bear in the direct line of pressure and the casing extends around the balls nearly to their centers, but on a greater are than the surface of the balls, to form guides therefor in order to allow a little side play for the balls. Thus constructed there is no friction on the sides or poles of the balls. (See Fig. 3.) The same is true as to the bearing-surfaces of the cone members.

When the several parts are constructed and collocated or set up as illustrated, the wheel or pulley willproject through the opening 11 of the face-plate 10, and the sash-cord (not shown) may run over the grooved periphery of the wheel and downward in front of the lower portion of the face-plate, space being provided between said wheel and the end portions of the side plates 18 19 for the accommodation of said cord. The wheel or pulley is held in its proper relations to the inner faces of the side plates by the bearing=balls supported on the cone members.

The face-plate 10 may be omitted, as shown in Fig. 7. Some sash-pulleys are now made without a face-plate. The face-plate makes a better finish, but is not essential to the operation of the pulley.

The pulley may be made in one piece without departing from my invent-ion.

I claim as my invention- 1. In a sash-pulley, the casing formed of counterpart side plates, a central portion in each plate pressed inwardly in concentric superposed fluted rings ending in an apertured flat surface parallel with the body of said side plates, and the two plates joined by suitable means through the apertures in said flat sur; faces.

2. In a sash-pulley, the casing formed of counterpart side plates having their centers pressed inwardly to form meeting cones, each cone being formed with a fluted ring at its apex, and their ends bent toward each other.

3. In asash-pulley, a casing formed by counterpart side plates, a central portion in each plate pressed inwardly in concentric superposed fluted rings ending in an apertured flat surface parallel with the body of said side plate, said side plates rigidly connected together through said apertured flat surfaces, in combination with a pulley formed by counterpart plates of sheet metal and having outwardly-turned flanges on their inner margins, said counterpart plates forming said pulley rigidly connected together, and bearing-balls interposed and forming a roller-bearing between the inner flanges of the pulley and the inner fluted rings of the casing.

Signed at Norwich, Connecticut, this 13th day of June, 1901.

ALLEN JOHNSTON.

\Vitnesses:

FRANK H. ALLEN, MAY F. RITCHIE. 

